AUTOMATIC QUADRATURE CONTROL AND MEASURING SYSTEM
First Claim
1. An electronic system comprising a reactive measurement transducer, means to detect quadrature signals produced by said transducer comprising two transistors connected collector-to-collector with a source of a signal approximately in phase with said quadrature signals connected in two circuits, each including the base and collector of one of said transistors, with output signals from said transducer connected to an emitter of one of said transistors, the emitter of the other of said transistors of said means to detect connected to a diode, the output of said diode being connected through a resistor to ground and the junction of said diode and said resistor being connected to the base of an amplifying transistor, the collector of said amplifying transistor being connected to a source of reference potential and the base of said amplifying transistor being connected to ground through an optical radiation generator which responds directly to electrical current, signals from said means to detect producing a decrease in output current of said amplifying transistor, thereby producing a decrease in light from said optical generator, a photoresponsive element adapted to respond to the radiation of said optical generator by reduction in electrical resistance with increase in said radiation, said optical generator and said photoresponsive element being in a light-isolation case, a resistor connected in series with said photoresponsive element and a source of said quadrature signals connected across said series connection of said photoresponsive element and said resistor, and a return resistor connected to the junction of said photoresponsive element and said resistor and connected to conduct said quadrature signals connected across said series connection through said return resistor in subtractive relationship to a location presenting signals produced by said transducer so that quadrature signals from said transducer are cancelled.
0 Assignments
0 Petitions
Accused Products
Abstract
A quadrature component cancellation and measuring system comprising a detection system for detecting the quadrature component from a primary signal, including reference circuitry to define the phase of the quadrature component for detection. A Raysistor optical coupling control device connects an output from the detection system to a circuit driven by a signal based upon the primary signal. Combining circuitry connects the primary signal and the circuit controlled by the Raysistor device to subtract quadrature components. A known current through the optically sensitive element produces a signal defining the magnitude of the quadrature component.
2 Citations
2 Claims
-
1. An electronic system comprising a reactive measurement transducer, means to detect quadrature signals produced by said transducer comprising two transistors connected collector-to-collector with a source of a signal approximately in phase with said quadrature signals connected in two circuits, each including the base and collector of one of said transistors, with output signals from said transducer connected to an emitter of one of said transistors, the emitter of the other of said transistors of said means to detect connected to a diode, the output of said diode being connected through a resistor to ground and the junction of said diode and said resistor being connected to the base of an amplifying transistor, the collector of said amplifying transistor being connected to a source of reference potential and the base of said amplifying transistor being connected to ground through an optical radiation generator which responds directly to electrical current, signals from said means to detect producing a decrease in output current of said amplifying transistor, thereby producing a decrease in light from said optical generator, a photoresponsive element adapted to respond to the radiation of said optical generator by reduction in electrical resistance with increase in said radiation, said optical generator and said photoresponsive element being in a light-isolation case, a resistor connected in series with said photoresponsive element and a source of said quadrature signals connected across said series connection of said photoresponsive element and said resistor, and a return resistor connected to the junction of said photoresponsive element and said resistor and connected to conduct said quadrature signals connected across said series connection through said return resistor in subtractive relationship to a location presenting signals produced by said transducer so that quadrature signals from said transducer are cancelled.
-
2. The system as in claim 1 also comprising means to apply a predetermined current across said photoresistive element and to observe the magnitude of the potential drop across said photoresistive element.
Specification
-
- Resources
-
Current AssigneeJohn F. Hamlet
-
Original AssigneeJohn F. Hamlet
-
InventorsHamlet, John F.
-
Primary Examiner(s)Smith, Alfred E.
-
Application NumberUS05/310,616Time in Patent Office510 DaysField of Search324/83A,83Q,8B,8FE 328/166 307/232US Class Current324/76.78CPC Class CodesG01R 21/006 Measuring power factorH04B 1/12 Neutralising, balancing, or...
